Many programmers consider Haskell to be alien.
It has an unconventional, non-C-like syntax, it has many features not commonly found in mainstream languages (yet), and it is considered to be quite hard to learn.
When someone expresses some interest in Haskell, they are usually directed towards one of the many books and learning resources available on the language, which is sometimes a little bit too much for someone who just wants to have a little taste.
I decided to write a presentation-style resource that tries to present a small part of Haskell and hopefully make it a little more accessible and a little less scary.
You can view the slides here.